<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--action：提交地址-->
<form action="http://www.baidu.com">
    <center>
        用户名：<input type="text" name="username" placeholder="请输入用户名"
                maxlength="5" value="abc" readonly="readonly"><br>

        密码 ：<input type="password" name="password"><br>
        <!--单选框 value 设置提交内容 否则提交on   checked默认选中-->
        性别： <input type="radio" name="gender" value="m"
                   id="r1"><label for="r1">男</label>
        <input type="radio" name="gender" checked="checked" value="w"
        id="r2"><label for="r2">女</label>
        <input type="radio" name="gender" value="n">人妖<br>

        兴趣爱好：
        <input type="checkbox" name="hobby" value="cy">抽烟
        <input type="checkbox" name="hobby" checked value="hj">喝酒
        <input type="checkbox" name="hobby" value="tt">烫头<br>

        生日:<input type="date" name="birthday"><br>
        靓照：<input type="file" name="pic"><br>
        所在地：
        <select name="city">
            <option value="bj">北京</option>
            <option value="sh" selected>上海</option>
            <option value="gz">广州</option>
        </select><br>
        <!--重置按钮-->
        <input type="reset" value="重置">
        <!--自定义按钮-->
        <input type="button" value="按钮">
        <input type="submit" value="注册"><br>

        <!--通过button标签实现上面的效果-->
        <button type="submit">注册</button>
        <button type="reset">重置</button>
        <button type="button">自定义</button>

    </center>
</form>

<div>div1</div>
<div>div2</div>
<div>div3</div>
<span>span1</span>
<span>span2</span>
<span>span3</span>
</body>
</html>